Your homemade laundry soap recipe?

I'm looking for someone who's made homemade laundry soap before and had it work successfully. I've already looked through google, so links aren't really going to be useful. I have bought a bar of Fels-Naptha, a box of borax and a box of washing soda. I've seen recipes for just mixing the three together and I've seen recipes for making a liquid detergent. What works best and what proportions of each work best for general washing? I would just consider adding or reducing the amount for a heavy/light load.